Patents by Inventor Astrid Hartwijk

Astrid Hartwijk has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Downhole device for controlling fluid flow in a well
    Patent number: 6679324
    Abstract: There is provided a downhole device for controlling the flow of fluids through an oil and/or gas production well comprises a deformable chamber which contains an electromagnetic field or other stimuli responsive gel and a fluid passage which is closed off in response to a volume increase of the gel and the deformable chamber.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: January 20, 2004
    Assignee: Shell Oil Company
    Inventors: Johannis Josephus Den Boer, Astrid Hartwijk, Gerald Sommerauer, John Foreman Stewart
  • Downhole device for controlling fluid flow in a well
    Publication number: 20020174981
    Abstract: There is provided a downhole device for controlling the flow of fluids through an oil and/or gas production well comprises a deformable chamber which contains an electromagnetic field or other stimuli responsive gel and a fluid passage which is closed off in response to a volume increase of the gel and the deformable chamber.
    Type: Application
    Filed: February 20, 2002
    Publication date: November 28, 2002
    Inventors: Johannis Josephus Den Boer, Astrid Hartwijk, Gerald Sommerauer, John Foreman Stewart